How can you tell if the quality of leather is good?
Usually genuine (whole) leather will last you a long way.
On the other hand, bonded/ reconstituted leather will not because it is made of dust/ scraps of leather that are bonded together. They do not have the natural characteristics of whole leather. They wear quickly, and likely to break/ tear.
It takes a while to recognise the types of leathers. Natural leathers will usually have some marks on them, as often the bonded leathers will look 'too good to be true' as they'd appear to be perfect (unless if you're paying at least $12,000 on just cow leather for a small bag).
So don't be afraid to see some natural scratches on leathers.